X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-oa0-f41.google.com ([209.85.219.41] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6326459 for flyrotary@lancaironline.net; Fri, 14 Jun 2013 22:47:56 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.219.41; envelope-from=keltro@gmail.com Received: by mail-oa0-f41.google.com with SMTP id n10so1523469oag.14 for ; Fri, 14 Jun 2013 19:47:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=9wxYgD07nLrNBSGBdjg0R+9e55dwwvCRFIQQOpa4pvU=; b=A7UyxVCxDhE9+f0h6yl8EZBap1itP7k/mvusYLOuKFoFqTiKuv43ThEJdrgI6LmjgW zxqE8k7xHTYezkuR3XpT7nODxAJ6Y4AcSpMwr8uxZ66KAFniAzfOpVhag6XtZX5RHpLH tDo+KEFO3pNnGalJjZhvlrHFVvGJtFMaM+htWmOWB3sJTR47UxW7+gqw1fFi4O+rmYE7 U8HYKzSy+1n2YYXbL+H7PlWmpzDE97sSyZUC3+z66bdnSGOW82SXSvMBDWPBULEOrrTu 2oZBNz5M0/Q5Ur2LTHd6U1NGdQWcxqezDTuQgcN3+/kKX1Mly8jMBrgW1SnMLsNsc8Ja v0fA== MIME-Version: 1.0 X-Received: by 10.60.174.83 with SMTP id bq19mr3259170oec.80.1371264440452; Fri, 14 Jun 2013 19:47:20 -0700 (PDT) Received: by 10.76.116.69 with HTTP; Fri, 14 Jun 2013 19:47:20 -0700 (PDT) In-Reply-To: References: Date: Fri, 14 Jun 2013 21:47:20 -0500 Message-ID: Subject: Re: [FlyRotary] Re: Airworthiness Cert issued....followed by blown enigne From: Kelly Troyer To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=089e0115f6c6ddcf9704df286163 --089e0115f6c6ddcf9704df286163 Content-Type: text/plain; charset=ISO-8859-1 On Fri, Jun 14, 2013 at 9:27 PM, Mark Steitle wrote: > Sorry for the bad news, but good thing it happened on the ground. > > As for the possibility of detonation, it doesn't sound like it to me. If > it was detonation, I would expect to find a broken apex seal or two. > Sounds like maybe an o-ring blew. It could have even been a defective > iron. Pictures would help. > > Mark > > > On Fri, Jun 14, 2013 at 7:38 PM, wrote: > >> N89SE received it's Airworthiness Certificate June 13, 2013! Yay! >> So I put the covers on it an pulled it out of the hangar for a start up >> and taxi test. >> I have not run it this year while finishing the airframe. >> So I started it up, a bit behind the curve on the EC-2, chasing the >> mixture around etc, then settled in to a nice smooth high idle and taxi'd >> down to the far end of the runway where I ran it up to 4400 +RPM, checked >> the water & oil temps, (158 & 167) pulled out on the runway, and fed the >> power to it for a 2 or 3 second burst, to be pulled off to prevent flight. >> Well the thing started well enough, I pushed the throttle slowly to about >> 2/3, and as the plane gained some speed, the CATTO 68x74 prop unloaded a >> bit and the RPMs went up. The acceleration was profound for about 2 seconds >> followed by a POP! as or just before I started to pull the throttle back. >> Then came the grey smoke as I shut down the fuel pump and glided off the >> runway to the taxiway. >> A few guys came running to help. One asked 'How ya doin'?" Medium I >> replied. (I'm OK and nothing is burning). Yada Yada, The plane is back @ >> the hangar, and the oil leak (spew) is a cracked block at the last oil tap >> fitting on the top gallery, by the distributor pulse counter. (1986 type) >> Today I stripped the engine and pulled it off the airframe. Looking in >> the ports, all the tip seals move and are springy, but I think I detonated >> it, some damage is visible. Maybe in a previous tethered run (to 40" >> manifold press), and this time it let go. compression was down (prop pull >> method) I wonder if detonation under boost will crack the block (end irons)? >> > > What a letdown after your AW certificate.........Curious what type of fitting you have in that oil galley........As I recall from my 1988 13B front housing the side walls may be a little thin after threading.............If a tapered pipe thread fitting was used the pressure from the tapered thread can crack the hsg.......I would suggest using straight threaded fittings (US or Metric) with alum , copper or "O" ring for sealing.............FWIW -- Kelly Troyer Dyke Delta_"Eventually" 13B_RD1C_EC2_EM2 --089e0115f6c6ddcf9704df286163 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable



On Fri, Jun 14, 2013 at 9:27 PM, Mark Steitle <= ;msteitle@gmail.com= > wrote:
Sorry for the bad news, but good thing it= happened on the ground. =A0

As for the possibility of detonation, it doesn't sound l= ike it to me. =A0If it was detonation, I would expect to find a broken apex= seal or two. =A0Sounds like maybe an o-ring blew. =A0It could have even be= en a defective iron. =A0Pictures would help. =A0

Mark


On F= ri, Jun 14, 2013 at 7:38 PM, <shipchief@aol.com> wrote:
N89SE received it's Airworthiness Certificate June 13, 201= 3! Yay!
So I put the covers on it an pulled it out of the hangar for a start u= p and taxi test.
I have not run it this year while finishing the airframe.
So I started it up, a bit behind the curve on the EC-2, chasing the mi= xture around etc, then settled in to a nice smooth high idle and taxi'd= down to the far end of the runway where I ran it up to 4400 +RPM, checked = the water & oil temps, (158 & 167) pulled out on the runway, and fe= d the power to it for a 2 or 3 second burst, to be pulled off to prevent fl= ight.
Well the thing started well enough, I pushed the throttle slowly to ab= out 2/3, and as the plane gained some speed, the CATTO 68x74 prop unloaded = a bit and the RPMs went up. The acceleration was profound for about 2 secon= ds followed by a POP! as or just before I started to pull the throttle back= .
Then came the grey smoke as I shut down the fuel pump and glided off t= he runway to the taxiway.
A few guys came running to help. One asked 'How ya doin'?"= ; Medium I replied. (I'm OK and nothing is burning). Yada Yada, The pla= ne is back @ the hangar, and the oil leak (spew) is a cracked block at the = last oil tap fitting on the top gallery, by the distributor pulse counter. = (1986 type)
Today I stripped the engine and pulled it off the airframe. Looking in= the ports, all the tip seals move and are springy, but I think I detonated= it, some damage is visible.=A0Maybe in a previous tethered run (to 40"= ; manifold press), and this time it let go. compression was down (prop pull= method) I wonder if detonation under boost will crack the block (end irons= )?


What a letdown after your AW certificate= .........Curious what type of fitting you have in that oil galley........As= I recall from my
1988 13B front housing the side walls may be a little= thin after threading.............If a tapered pipe thread fitting was used= the=A0
pressure from the tapered thread can crack the hsg.......I would sugge= st using straight threaded fittings (US or Metric) with
alum , co= pper or "O" ring for sealing.............FWIW

--
Kelly Troyer
Dyke Delta_"Eventually"
13B_RD1C_EC2_EM= 2
--089e0115f6c6ddcf9704df286163--